Quick question 09 3500 lmm

[flex]

I have a quick question I have a customer wanting to delete the cat and dpf b/c he keeps getting the engine reduced power b/c of the dpf filter. If he lets it idle for a short period it does it. Did it 4 time yesterday on a 400 mile trip he took.
Reason I ask is I have a customer with a 08 and it has straight exhaust and has said to had a tuner on it before but was taken off.It has no codes or lights or issues.
So the QUestion is if I install the straight exhaust on his and he has no tuner on it . ( mainly b/c just had a new GM motor put in a few months ago) Will it throw codes or go to reduced power b/c of the cat and dpf delete? :thumb: Thanks for any replies

 

[Burn Down]

It will have codes for sure... That 08 didn't have the delete tune removed.

 

[WolfLMM]

Not only will it throw codes, it will smoke white continueously. Eye watering white Diesel smoke.

 

[Harbin_22]

Sometimes they will run for a little while without a tune, but sooner or later, sooner, they will go into limp mode

 

[WVRigrat05]

Wait a minute, you have a shop and you don't know this shit?

You can tune a truck with the DPF on.

You cannot throw a full exhaust on a truck and keep the stock tune, it will go into limp mode right away.

Now if you leave the stock system on and do a DPF delete pipe, it may run a week and may run 20 minutes before it limps, but it's gonna limp, no way around it period without a tune or chip that disables the DPF.

 

[THEFERMANATOR]

Several have gotten away for a thousand or 2 thousand miles, but eventually it will code and shut you down to a crawl. No way around it. And once it starts shutting down, you can clear it, but it will come back quicker and quicker each time. Had somebody limp one into my place to tune it, eventually got to whefe he could only go about 5 miles and was limited to 25 then 5 by the time he crawled into my place.

 

[flex]

I'm not a diesel shop!! new to this and just have my own 09 lmm . I installed tuner and deleted egr and dpf , on my own .Thanks a lot to you guys advise. Have friends with these others.

 

[WolfLMM]

Several have gotten away for a thousand or 2 thousand miles, but eventually it will code and shut you down to a crawl. No way around it. And once it starts shutting down, you can clear it, but it will come back quicker and quicker each time. Had somebody limp one into my place to tune it, eventually got to whefe he could only go about 5 miles and was limited to 25 then 5 by the time he crawled into my place.

I've never seen any of that. Had a buddy drive his for over a year with no tune, and it never limited his speed. Just smoked white all the time. It's a long story so save the stupid remarks about people not fixing things properly.

Last sentence not directed towards you ferm, just all the parrots in general.

 

[WVRigrat05]

I've never seen any of that. Had a buddy drive his for over a year with no tune, and it never limited his speed. Just smoked white all the time. It's a long story so save the stupid remarks about people not fixing things properly.

Last sentence not directed towards you ferm, just all the parrots in general.

My friend lost his job and we did the delete pipes only on his lml and it hated life, but he could go faster than the 20 mph he was prior to us doing it. I left my sensors hooked up on my truck with the 4" exhaust just to move it and it ran just fine but smelled like an lb7 with bad injectors.

I'd be too paranoid to do it to my truck.

 

[THEFERMANATOR]

I've never seen any of that. Had a buddy drive his for over a year with no tune, and it never limited his speed. Just smoked white all the time. It's a long story so save the stupid remarks about people not fixing things properly.

Last sentence not directed towards you ferm, just all the parrots in general.

I know some with LMM's said they were fine. I know this was an 07, didn't smoke a bit, but he CRAWLED into my driveway with it sounding like SH!T! Put the tune in it and it fired up completely normal, only issue was we didn't have the blocker plate, and it would blow black BAD even on stock tuning. Put the blocker plate in and it didn't smoke anymore.

 

[mebob2001]

Would just be a good idea to tune it. Going around line an lb7 just pisses off the dot/EPA and gets them on our asses even worse

Sent from my SM-G903W using Tapatalk